mdw@git.distorted.org.uk Git - profile/blob - bin/disorder-notify

   1 #! /usr/bin/perl -w
   2
   3 use autodie qw{:all};
   4 use strict;
   5
   6 use DisOrder;
   7 use File::FcntlLock;
   8 use Getopt::Long qw{:config gnu_compat bundling
   9                     require_order no_getopt_compat};
  10 use POSIX qw{:errno_h :fcntl_h};
  11
  12 ###--------------------------------------------------------------------------
  13 ### Configuration.
  14
  15 my %C = (config => "$ENV{HOME}/.disorder/passwd",
  16          lockdir => "$ENV{HOME}/.disorder/",
  17          mixer => "Master,0");
  18
  19 (my $PROG = $0) =~ s:^.*/::;
  20 my $TITLE = "DisOrder";
  21 my $VARIANT = "default";
  22 if (-l $C{config} && (my $t = readlink $C{config}) =~ /^passwd\.(.*)$/)
  23   { $VARIANT = $1; $TITLE .= " ($1)"; }
  24
  25 ###--------------------------------------------------------------------------
  26 ### Random utilities.
  27
  28 sub run_discard_output (@) {
  29   my $kid = fork();
  30   if (!$kid) {
  31     open STDOUT, ">/dev/null" or die "open /dev/null: $!";
  32     exec @_;
  33   }
  34   waitpid $kid, 0;
  35   if ($?) {
  36     my $st;
  37     if ($? >= 256) { $st = sprintf "rc = %d", $? >> 8; }
  38     else { $st = sprintf "signal %d", $?; }
  39     die "$_[0] failed ($st)";
  40   }
  41 }
  42
  43 sub notify ($$) {
  44   my ($head, $body) = @_;
  45
  46   $body =~ s:\&:&amp;:g;
  47   $body =~ s:\<:&lt;:g;
  48   $body =~ s:\>:&gt;:g;
  49
  50   ##print "****************\n$head\n\n$body\n"; return;
  51
  52   run_discard_output "notify-send",
  53     "-c", "DisOrder", "-i", "audio-volume-high", "-t", "5000",
  54     $head, $body;
  55 }
  56
  57 sub try_unlink ($) {
  58   my ($f) = @_;
  59   eval { unlink $f; };
  60   die $@ if $@ and $@->errno != ENOENT;
  61 }
  62
  63 ###--------------------------------------------------------------------------
  64 ### Locking protocol.
  65
  66 my $LKFILE = "$C{lockdir}/disorder-notify-$VARIANT.lock";
  67 my $LKFH;
  68
  69 sub locked_by () {
  70
  71   ## Try to open the lock file.  If it's not there, then obviously it's not
  72   ## locked.
  73   my $fh;
  74   eval { open $fh, "<", $LKFILE; };
  75   if ($@) {
  76     return undef if $@->errno == ENOENT;
  77     die $@;
  78   }
  79
  80   ## Take out a non-exclusive lock on the lock file.
  81   my $lk = new File::FcntlLock;
  82   $lk->l_type(F_RDLCK); $lk->l_whence(SEEK_SET);
  83   $lk->l_start(0); $lk->l_len(0);
  84   if ($lk->lock($fh, F_SETLK)) { close $fh; return undef; }
  85
  86   ## Read the pid of the current lock-holder.
  87   chomp (my $pid = (readline $fh) // "<unknown>");
  88   close $fh;
  89   return $pid;
  90 }
  91
  92 sub claim_lock () {
  93   sysopen my $fh, $LKFILE, O_CREAT | O_WRONLY;
  94
  95   my $lk = new File::FcntlLock;
  96   $lk->l_type(F_WRLCK); $lk->l_whence(SEEK_SET);
  97   $lk->l_start(0); $lk->l_len(0);
  98   if (!$lk->lock($fh, F_SETLK)) {
  99     return undef if $! == EAGAIN;
 100     die "failed to lock `$LKFILE': $!";
 101   }
 102
 103   truncate $fh, 0;
 104   print $fh "$$\n";
 105   flush $fh;
 106   $LKFH = $fh;
 107   1;
 108 }
 109
 110 ###--------------------------------------------------------------------------
 111 ### DisOrder utilities.
 112
 113 sub get_state0 ($) {
 114   my ($sk) = @_;
 115   my %st = ();
 116
 117   LINE: for (;;) {
 118     my @f = split_fields readline $sk;
 119     if ($f[1] ne "state") { last LINE; }
 120     elsif ($f[2] eq "enable_random") { $st{random} = 1; }
 121     elsif ($f[2] eq "disable_random") { $st{random} = 0; }
 122     elsif ($f[2] eq "enable_play") { $st{play} = 1; }
 123     elsif ($f[2] eq "disable_play") { $st{play} = 0; }
 124     elsif ($f[2] eq "resume") { $st{pause} = 0; }
 125     elsif ($f[2] eq "pause") { $st{pause} = 1; }
 126   }
 127   return \%st;
 128 }
 129
 130 my $CONF = undef;
 131
 132 sub configured_connection (;$) {
 133   my ($quietp) = @_;
 134   $CONF //= load_config $C{config};
 135   return connect_to_server %$CONF, $quietp // 0;
 136 }
 137
 138 sub get_state () {
 139   my $sk = configured_connection;
 140   send_command0 $sk, "log";
 141   my $st = get_state0 $sk;
 142   close $sk;
 143   return $st;
 144 }
 145
 146 sub decode_track_name ($\%) {
 147   my ($sk, $info) = @_;
 148   return unless exists $info->{track};
 149   my $track = $info->{track};
 150   for my $i ("artist", "album", "title") {
 151     my @f = split_fields send_command $sk, "part", $track, "display", "$i";
 152     $info->{$i} = $f[0];
 153   }
 154 }
 155
 156 sub fmt_duration ($) {
 157   my ($n) = @_;
 158   return sprintf "%d:%02d", int $n/60, $n%60;
 159 }
 160
 161 sub format_now_playing (\%) {
 162   my ($info) = @_;
 163   exists $info->{track} or return "Nothing.";
 164   my $r = "$info->{artist}: ‘$info->{title}’";
 165   $r .= ", from ‘$info->{album}’" if $info->{album};
 166   exists $info->{sofar} && exists $info->{length} and
 167     $r .= sprintf " (%s/%s)",
 168       fmt_duration $info->{sofar}, fmt_duration $info->{length};
 169   $r .= "\n(chosen by $info->{submitter})" if exists $info->{submitter};
 170   return $r;
 171 }
 172
 173 sub get_now_playing ($) {
 174   my ($sk) = @_;
 175   my $r = send_command $sk, "playing";
 176   defined $r or return {};
 177   my %info = split_fields $r;
 178   decode_track_name $sk, %info;
 179   exists $info{sofar} and
 180     $info{length} = send_command $sk, "length", $info{track};
 181   return \%info;
 182 }
 183
 184 sub watch_and_notify0 ($) {
 185   my ($now_playing) = @_;
 186
 187   my $sk = configured_connection 1;
 188   my $sk_log = configured_connection 1;
 189
 190   send_command0 $sk_log, "log";
 191   my $st = get_state0 $sk_log;
 192   my $msg = "playing " . ($st->{play} ? "enabled" : "disabled");
 193   $msg .= "; random play " . ($st->{random} ? "enabled" : "disabled");
 194   $msg .= "; " . ($st->{pause} ? "paused" : "playing");
 195   notify "$TITLE state", "Connected: $msg";
 196   if ($st->{play} && $now_playing) {
 197     my $info = get_now_playing $sk;
 198     notify "$TITLE: Now playing", format_now_playing %$info;
 199   }
 200
 201   fcntl $sk_log, F_SETFL, (fcntl $sk_log, F_GETFL, 0) | O_NONBLOCK;
 202   my $buffer = "";
 203   my @lines = ();
 204   my $rdin = ""; vec($rdin, (fileno $sk_log), 1) = 1;
 205   my $loss;
 206
 207   WATCH: for (;;) {
 208     for my $line (@lines) {
 209       my @f = split_fields $line;
 210       if ($f[1] eq "state") {
 211         my $msg = undef;
 212         if ($f[2] eq "disable_random") { $msg = "Random play disabled"; }
 213         elsif ($f[2] eq "enable_random") { $msg = "Random play enabled"; }
 214         elsif ($f[2] eq "disable_play") { $msg = "Playing disabled"; }
 215         elsif ($f[2] eq "enable_play") { $msg = "Playing enabled"; }
 216         elsif ($f[2] eq "pause") { $msg = "Paused"; }
 217         elsif ($f[2] eq "resume") { $msg = "Playing"; }
 218         notify "$TITLE state", $msg if defined $msg;
 219       } elsif ($f[1] eq "playing") {
 220         my %info;
 221         $info{track} = $f[2];
 222         $info{submitter} = $f[3] if @f > 3;
 223         decode_track_name $sk, %info;
 224         notify "$TITLE: Now playing", format_now_playing %info;
 225       } elsif ($f[1] eq "scratched") {
 226         my %info;
 227         $info{track} = $f[2];
 228         decode_track_name $sk, %info;
 229         notify "$TITLE: Scratched by $f[3]", format_now_playing %info;
 230       }
 231     }
 232
 233     if (!$sk_log) { $loss = "EOF from server"; last WATCH; }
 234     my $nfd = select my $rdout = $rdin, undef, undef, 60;
 235     if (!$nfd) {
 236       eval { print $sk_log "."; flush $sk_log; };
 237       if ($@) { $loss = "error from write: " . $@->errno; last WATCH; }
 238       @lines = ();
 239     } else {
 240       READ: for (;;) {
 241         my ($b, $n);
 242         eval { $n = sysread $sk_log, $b, 4096; };
 243         if ($@ && $@->errno == EAGAIN) { last READ; }
 244         elsif ($@) { $loss = "error from read: " . $@->errno; last WATCH; }
 245         elsif (!$n) { close $sk_log; $sk_log = undef; last READ; }
 246         else { $buffer .= $b; }
 247       }
 248
 249       @lines = split /\n/, $buffer, -1;
 250       $buffer = pop @lines;
 251     }
 252   }
 253
 254   notify "$TITLE state", "Lost connection: $loss";
 255
 256   close $sk;
 257   close $sk_log if defined $sk_log;
 258 }
 259
 260 sub watch_and_notify ($) {
 261   my ($now_playing) = @_;
 262
 263   claim_lock or exit 1;
 264
 265   for (;;) {
 266     eval { watch_and_notify0 $now_playing; };
 267     $now_playing = 1;
 268     sleep 5;
 269   }
 270 }
 271
 272 ###--------------------------------------------------------------------------
 273 ### User-facing operations.
 274
 275 my %OP;
 276
 277 $OP{"volume-up"} =
 278   sub { run_discard_output "amixer", "sset", $C{mixer}, "5\%+"; };
 279 $OP{"volume-down"} =
 280   sub { run_discard_output "amixer", "sset", $C{mixer}, "5\%-"; };
 281
 282 $OP{"scratch"} = sub {
 283   my $sk = configured_connection;
 284   send_command $sk, "scratch";
 285   close $sk;
 286 };
 287
 288 $OP{"enable/disable"} = sub {
 289   my $st = get_state;
 290   my $sk =configured_connection;
 291   if ($st->{play}) { send_command $sk, "disable"; }
 292   else { send_command $sk, "enable"; }
 293   close $sk;
 294 };
 295
 296 $OP{"play/pause"} = sub {
 297   my $st = get_state;
 298   my $sk = configured_connection;
 299   if (!$st->{play}) {
 300     send_command $sk, "enable";
 301     if ($st->{pause}) { send_command $sk, "resume"; }
 302   } else {
 303     if ($st->{pause}) { send_command $sk, "resume"; }
 304     else { send_command $sk, "pause"; }
 305   }
 306   close $sk;
 307 };
 308
 309 $OP{"watch"} = sub {
 310   if (defined (my $lkpid = locked_by)) {
 311     print STDERR "$0: already watched by pid $lkpid\n";
 312     exit 2;
 313   }
 314   watch_and_notify 1;
 315 };
 316
 317 $OP{"now-playing"} = sub {
 318   my $sk = configured_connection;
 319   my $info = get_now_playing $sk;
 320   close $sk;
 321   print format_now_playing %$info;
 322   print "\n";
 323 };
 324
 325 $OP{"notify-now-playing"} = sub {
 326   my $sk = configured_connection;
 327   my $info = get_now_playing $sk;
 328   close $sk;
 329   notify "$TITLE: Now playing", format_now_playing %$info;
 330   unless (defined locked_by) {
 331     fork and exit 0;
 332     watch_and_notify 0;
 333   }
 334 };
 335
 336 $OP{"next-config"} = sub {
 337   (my $dir = $C{config}) =~ s:/[^/]*$::;
 338   my (@conf, $curr, $conf, $min);
 339
 340   if (-l $C{config} && (my $t = readlink $C{config}) =~ /^passwd\.(.*)$/)
 341     { $curr = $1; }
 342
 343   opendir my $dh, +$dir;
 344   FILE: while (my $f = readdir $dh)
 345     { push @conf, $1 if $f =~ /^passwd\.(.*[^~])$/; }
 346
 347   for (my $i = 0; $i < @conf; $i++) {
 348     $min = $conf[$i] if (!defined $min) || $conf[$i] lt $min;
 349     $conf = $conf[$i]
 350       if ((!defined $curr) || $curr lt $conf[$i]) &&
 351          ((!defined $conf) || $conf[$i] lt $conf);
 352   }
 353   $conf = $min unless defined $conf;
 354
 355   try_unlink "$dir/passwd.new";
 356   symlink "passwd.$conf", "$dir/passwd.new";
 357   rename "$dir/passwd.new", "$dir/passwd";
 358   notify "DisOrder configuration", "Switched to `$conf'";
 359 };
 360
 361 ###--------------------------------------------------------------------------
 362 ### Main program.
 363
 364 sub usage (\*) {
 365   my ($fh) = @_;
 366   print $fh "usage: $PROG [-u CONFIG] COMMAND\n";
 367 }
 368
 369 sub help () {
 370   usage *STDOUT;
 371   print <<EOF;
 372
 373 Command-line options:
 374   -h, --help            Show this help text
 375   -u, --user-config     Set user configuration file
 376
 377 Commands:
 378   volume-up
 379   volume-down
 380   scratch
 381   enable/disable
 382   play/pause
 383   watch
 384   now-playing
 385   notify-now-playing
 386   next-config
 387 EOF
 388 }
 389
 390 my $bad = 0;
 391 GetOptions
 392   "h|help" => sub { help; exit 0; },
 393   "u|user-config=s" => \$C{config}
 394     or $bad = 1;
 395 @ARGV == 1 or $bad = 1;
 396 if ($bad) { usage *STDERR; exit 2; }
 397 my $op = $ARGV[0];
 398 if (!exists $OP{$op}) { print STDERR "$0: unknown op `$op'\n"; exit 2; }
 399 $OP{$op}();
 400
 401 ###----- That's all, folks --------------------------------------------------